“There is no such thing as a new idea. It is impossible. We simply take a lot of old ideas and put them into a sort of mental kaleidoscope. We give them a turn and they make new and curious combinations. We keep on turning and making new combinations indefinitely; but they are the same old pieces of colored glass that have been in use through all the ages.”
Paine, Albert Bigelow. Mark Twain, A Biography: The Personal and Literary Life of Samuel Langhorne Clemens (Source).